2165015 has 4 divisors (see below), whose sum is σ = 2598024. Its totient is φ = 1732008.

The previous prime is 2164991. The next prime is 2165017. The reversal of 2165015 is 5105612.

2165015 = 254² + 255² + ... + 283².

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2165015 - 2¹⁴ = 2148631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216497 + ... + 216506.

It is an arithmetic number, because the mean of its divisors is an integer number (649506).

2^2165015 is an apocalyptic number.

2165015 is a deficient number, since it is larger than the sum of its proper divisors (433009).

2165015 is an equidigital number, since it uses as much as digits as its factorization.

2165015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433008.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2165015 is about 1471.3989941549. The cubic root of 2165015 is about 129.3660456513.

The spelling of 2165015 in words is "two million, one hundred sixty-five thousand, fifteen".